Finally, we would like to remark on the virtual terms of the type \(J_{L}^{a} J_{L}^{a} \) .
They are expected to come with the same kernel \(K_{JSJ}^{m} \) , though we have not explicitly demonstrated
this here. These terms appear from the normalization of the wave function.
It is straightforward to see [1]} that the kernel in front of the virtual terms
is indeed the same as the one in front of the real term, including the mass corrections.
